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Q.

The length of second's hand in a watch is 1 cm. The change in velocity of its tip in 15 seconds is

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a

zero

b

π302cm/sec

c

π30 cm/sec

d

π230 cm/sec

answer is D.

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Detailed Solution

∆v = 2vsin(9002)= 2vsin450 = 2v×12  = 2v= 2×rω = 2×1×2π60 = 2π30cm/s
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